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lm-sensors/kernel/chips/adm1021.c
T
Jean Delvare 835d3937dd Backport misdetection prevention patch from 2.6: 
* Use unused bits of two more registers (configuration and conversion
rate) to reduce misdetections.

* Return with -ENODEV if the detection fails.

* Change the order in which we try to identify the chips. We better
finish with the LM84 and the MAX1617, in this order, because they are
harder to identify and are more likely to result in false positives.

* Refine LM84 detection. The LM84 has less features than the other chips
(chip cannot be stopped, conversion rate cannot be set, no low limits)
so it has extra unused bits.

* Do not intialize the chip if it was detected as an LM84. This one
cannot be stopped so why would we try to start it again? And as said
right before, conversion rate isn't changeable either.


git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@2395 7894878c-1315-0410-8ee3-d5d059ff63e0
2004-03-27 16:12:20 +00:00

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/*
adm1021.c - Part of lm_sensors, Linux kernel modules for hardware
monitoring
Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and
Philip Edelbrock <phil@netroedge.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/i2c-proc.h>
#include <linux/init.h>
#include "version.h"
/* Addresses to scan */
static unsigned short normal_i2c[] = { SENSORS_I2C_END };
static unsigned short normal_i2c_range[] = { 0x18, 0x1a, 0x29, 0x2b,
0x4c, 0x4e, SENSORS_I2C_END
};
static unsigned int normal_isa[] = { SENSORS_ISA_END };
static unsigned int normal_isa_range[] = { SENSORS_ISA_END };
/* Insmod parameters */
SENSORS_INSMOD_8(adm1021, adm1023, max1617, max1617a, thmc10, lm84, gl523sm, mc1066);
/* adm1021 constants specified below */
/* The adm1021 registers */
/* Read-only */
#define ADM1021_REG_TEMP 0x00
#define ADM1021_REG_REMOTE_TEMP 0x01
#define ADM1021_REG_STATUS 0x02
#define ADM1021_REG_MAN_ID 0x0FE /* 0x41 = Analog Devices, 0x49 = TI,
0x4D = Maxim, 0x23 = Genesys , 0x54 = Onsemi*/
#define ADM1021_REG_DEV_ID 0x0FF /* ADM1021 = 0x0X, ADM1021A/ADM1023 = 0x3X */
#define ADM1021_REG_DIE_CODE 0x0FF /* MAX1617A */
/* These use different addresses for reading/writing */
#define ADM1021_REG_CONFIG_R 0x03
#define ADM1021_REG_CONFIG_W 0x09
#define ADM1021_REG_CONV_RATE_R 0x04
#define ADM1021_REG_CONV_RATE_W 0x0A
/* These are for the ADM1023's additional precision on the remote temp sensor */
#define ADM1021_REG_REM_TEMP_PREC 0x010
#define ADM1021_REG_REM_OFFSET 0x011
#define ADM1021_REG_REM_OFFSET_PREC 0x012
#define ADM1021_REG_REM_TOS_PREC 0x013
#define ADM1021_REG_REM_THYST_PREC 0x014
/* limits */
#define ADM1021_REG_TOS_R 0x05
#define ADM1021_REG_TOS_W 0x0B
#define ADM1021_REG_REMOTE_TOS_R 0x07
#define ADM1021_REG_REMOTE_TOS_W 0x0D
#define ADM1021_REG_THYST_R 0x06
#define ADM1021_REG_THYST_W 0x0C
#define ADM1021_REG_REMOTE_THYST_R 0x08
#define ADM1021_REG_REMOTE_THYST_W 0x0E
/* write-only */
#define ADM1021_REG_ONESHOT 0x0F
#define ADM1021_ALARM_TEMP (ADM1021_ALARM_TEMP_HIGH | ADM1021_ALARM_TEMP_LOW)
#define ADM1021_ALARM_RTEMP (ADM1021_ALARM_RTEMP_HIGH | ADM1021_ALARM_RTEMP_LOW\
| ADM1021_ALARM_RTEMP_NA)
#define ADM1021_ALARM_ALL (ADM1021_ALARM_TEMP | ADM1021_ALARM_RTEMP)
/* Conversions. Rounding and limit checking is only done on the TO_REG
variants. Note that you should be a bit careful with which arguments
these macros are called: arguments may be evaluated more than once.
Fixing this is just not worth it. */
/* Conversions note: 1021 uses normal integer signed-byte format*/
#define TEMP_FROM_REG(val) (val > 127 ? val-256 : val)
#define TEMP_TO_REG(val) (SENSORS_LIMIT((val < 0 ? val+256 : val),0,255))
/* Each client has this additional data */
struct adm1021_data {
int sysctl_id;
enum chips type;
struct semaphore update_lock;
char valid; /* !=0 if following fields are valid */
unsigned long last_updated; /* In jiffies */
u8 temp, temp_os, temp_hyst; /* Register values */
u8 remote_temp, remote_temp_os, remote_temp_hyst, alarms, die_code;
u8 fail;
/* Special values for ADM1023 only */
u8 remote_temp_prec, remote_temp_os_prec, remote_temp_hyst_prec,
remote_temp_offset, remote_temp_offset_prec;
};
static int adm1021_attach_adapter(struct i2c_adapter *adapter);
static int adm1021_detect(struct i2c_adapter *adapter, int address,
unsigned short flags, int kind);
static void adm1021_init_client(struct i2c_client *client);
static int adm1021_detach_client(struct i2c_client *client);
static int adm1021_read_value(struct i2c_client *client, u8 reg);
static int adm1021_rd_good(u8 *val, struct i2c_client *client, u8 reg, u8 mask);
static int adm1021_write_value(struct i2c_client *client, u8 reg,
u16 value);
static void adm1021_temp(struct i2c_client *client, int operation,
int ctl_name, int *nrels_mag, long *results);
static void adm1021_remote_temp(struct i2c_client *client, int operation,
int ctl_name, int *nrels_mag,
long *results);
static void adm1021_alarms(struct i2c_client *client, int operation,
int ctl_name, int *nrels_mag, long *results);
static void adm1021_die_code(struct i2c_client *client, int operation,
int ctl_name, int *nrels_mag, long *results);
static void adm1021_update_client(struct i2c_client *client);
/* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */
static int read_only = 0;
/* This is the driver that will be inserted */
static struct i2c_driver adm1021_driver = {
.owner = THIS_MODULE,
.name = "ADM1021, MAX1617 sensor driver",
.id = I2C_DRIVERID_ADM1021,
.flags = I2C_DF_NOTIFY,
.attach_adapter = adm1021_attach_adapter,
.detach_client = adm1021_detach_client,
};
/* -- SENSORS SYSCTL START -- */
#define ADM1021_SYSCTL_TEMP 1200
#define ADM1021_SYSCTL_REMOTE_TEMP 1201
#define ADM1021_SYSCTL_DIE_CODE 1202
#define ADM1021_SYSCTL_ALARMS 1203
#define ADM1021_ALARM_TEMP_HIGH 0x40
#define ADM1021_ALARM_TEMP_LOW 0x20
#define ADM1021_ALARM_RTEMP_HIGH 0x10
#define ADM1021_ALARM_RTEMP_LOW 0x08
#define ADM1021_ALARM_RTEMP_NA 0x04
/* -- SENSORS SYSCTL END -- */
/* These files are created for each detected adm1021. This is just a template;
though at first sight, you might think we could use a statically
allocated list, we need some way to get back to the parent - which
is done through one of the 'extra' fields which are initialized
when a new copy is allocated. */
static ctl_table adm1021_dir_table_template[] = {
{ADM1021_SYSCTL_TEMP, "temp1", NULL, 0, 0644, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &adm1021_temp},
{ADM1021_SYSCTL_REMOTE_TEMP, "temp2", NULL, 0, 0644, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &adm1021_remote_temp},
{ADM1021_SYSCTL_DIE_CODE, "die_code", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &adm1021_die_code},
{ADM1021_SYSCTL_ALARMS, "alarms", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &adm1021_alarms},
{0}
};
static ctl_table adm1021_max_dir_table_template[] = {
{ADM1021_SYSCTL_TEMP, "temp1", NULL, 0, 0644, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &adm1021_temp},
{ADM1021_SYSCTL_REMOTE_TEMP, "temp2", NULL, 0, 0644, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &adm1021_remote_temp},
{ADM1021_SYSCTL_ALARMS, "alarms", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &adm1021_alarms},
{0}
};
static int adm1021_id = 0;
static int adm1021_attach_adapter(struct i2c_adapter *adapter)
{
return i2c_detect(adapter, &addr_data, adm1021_detect);
}
static int adm1021_detect(struct i2c_adapter *adapter, int address,
unsigned short flags, int kind)
{
int i;
struct i2c_client *new_client;
struct adm1021_data *data;
int err = 0;
const char *type_name = "";
const char *client_name = "";
/* Make sure we aren't probing the ISA bus!! This is just a safety check
at this moment; i2c_detect really won't call us. */
#ifdef DEBUG
if (i2c_is_isa_adapter(adapter)) {
printk
("adm1021.o: adm1021_detect called for an ISA bus adapter?!?\n");
return 0;
}
#endif
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
goto error0;
/* OK. For now, we presume we have a valid client. We now create the
client structure, even though we cannot fill it completely yet.
But it allows us to access adm1021_{read,write}_value. */
if (!(new_client = kmalloc(sizeof(struct i2c_client) +
sizeof(struct adm1021_data),
GFP_KERNEL))) {
err = -ENOMEM;
goto error0;
}
data = (struct adm1021_data *) (new_client + 1);
new_client->addr = address;
new_client->data = data;
new_client->adapter = adapter;
new_client->driver = &adm1021_driver;
new_client->flags = 0;
/* Now, we do the remaining detection. */
if (kind < 0) {
if ((adm1021_read_value(new_client, ADM1021_REG_STATUS) & 0x03) != 0x00
|| (adm1021_read_value(new_client, ADM1021_REG_CONFIG_R) & 0x3F) != 0x00
|| (adm1021_read_value(new_client, ADM1021_REG_CONV_RATE_R) & 0xF8) != 0x00) {
err = -ENODEV;
goto error1;
}
}
/* Determine the chip type. */
if (kind <= 0) {
i = adm1021_read_value(new_client, ADM1021_REG_MAN_ID);
if (i == 0x41)
if ((adm1021_read_value (new_client, ADM1021_REG_DEV_ID) & 0xF0) == 0x30)
kind = adm1023;
else
kind = adm1021;
else if (i == 0x49)
kind = thmc10;
else if (i == 0x23)
kind = gl523sm;
else if ((i == 0x4d) &&
(adm1021_read_value
(new_client, ADM1021_REG_DEV_ID) == 0x01))
kind = max1617a;
else if (i == 0x54)
kind = mc1066;
/* LM84 Mfr ID in a different place, and it has more unused bits */
else if (adm1021_read_value(new_client, ADM1021_REG_CONV_RATE_R) == 0x00
&& (kind == 0 /* skip extra detection */
|| ((adm1021_read_value(new_client, ADM1021_REG_CONFIG_R) & 0x7F) == 0x00
&& (adm1021_read_value(new_client, ADM1021_REG_STATUS) & 0xAB) == 0x00)))
kind = lm84;
else
kind = max1617;
}
if (kind == max1617) {
type_name = "max1617";
client_name = "MAX1617 chip";
} else if (kind == max1617a) {
type_name = "max1617a";
client_name = "MAX1617A chip";
} else if (kind == adm1021) {
type_name = "adm1021";
client_name = "ADM1021 chip";
} else if (kind == adm1023) {
type_name = "adm1023";
client_name = "ADM1023 chip";
} else if (kind == thmc10) {
type_name = "thmc10";
client_name = "THMC10 chip";
} else if (kind == lm84) {
type_name = "lm84";
client_name = "LM84 chip";
} else if (kind == gl523sm) {
type_name = "gl523sm";
client_name = "GL523SM chip";
} else if (kind == mc1066) {
type_name = "mc1066";
client_name = "MC1066 chip";
}
/* Fill in the remaining client fields and put it into the global list */
strcpy(new_client->name, client_name);
data->type = kind;
new_client->id = adm1021_id++;
data->valid = 0;
init_MUTEX(&data->update_lock);
/* Tell the I2C layer a new client has arrived */
if ((err = i2c_attach_client(new_client)))
goto error3;
/* Register a new directory entry with module sensors */
if ((i = i2c_register_entry(new_client, type_name,
data->type == adm1021 ? adm1021_dir_table_template :
adm1021_max_dir_table_template)) < 0) {
err = i;
goto error4;
}
data->sysctl_id = i;
/* Initialize the ADM1021 chip */
if (kind != lm84)
adm1021_init_client(new_client);
return 0;
error4:
i2c_detach_client(new_client);
error3:
error1:
kfree(new_client);
error0:
return err;
}
static void adm1021_init_client(struct i2c_client *client)
{
/* Enable ADC and disable suspend mode */
adm1021_write_value(client, ADM1021_REG_CONFIG_W,
adm1021_read_value(client, ADM1021_REG_CONFIG_R) & 0xBF);
/* Set Conversion rate to 1/sec (this can be tinkered with) */
adm1021_write_value(client, ADM1021_REG_CONV_RATE_W, 0x04);
}
static int adm1021_detach_client(struct i2c_client *client)
{
int err;
i2c_deregister_entry(((struct adm1021_data *) (client->data))->
sysctl_id);
if ((err = i2c_detach_client(client))) {
printk
("adm1021.o: Client deregistration failed, client not detached.\n");
return err;
}
kfree(client);
return 0;
}
/* All registers are byte-sized */
static int adm1021_read_value(struct i2c_client *client, u8 reg)
{
return i2c_smbus_read_byte_data(client, reg);
}
/* only update value if read succeeded; set fail bit if failed */
static int adm1021_rd_good(u8 *val, struct i2c_client *client, u8 reg, u8 mask)
{
int i;
struct adm1021_data *data = client->data;
i = i2c_smbus_read_byte_data(client, reg);
if (i < 0) {
data->fail |= mask;
return i;
}
*val = i;
return 0;
}
static int adm1021_write_value(struct i2c_client *client, u8 reg, u16 value)
{
if (read_only > 0)
return 0;
return i2c_smbus_write_byte_data(client, reg, value);
}
static void adm1021_update_client(struct i2c_client *client)
{
struct adm1021_data *data = client->data;
down(&data->update_lock);
if ((jiffies - data->last_updated > HZ + HZ / 2) ||
(jiffies < data->last_updated) || !data->valid) {
#ifdef DEBUG
printk("Starting adm1021 update\n");
#endif
data->fail = 0;
adm1021_rd_good(&(data->temp), client, ADM1021_REG_TEMP,
ADM1021_ALARM_TEMP);
adm1021_rd_good(&(data->temp_os), client, ADM1021_REG_TOS_R,
ADM1021_ALARM_TEMP);
adm1021_rd_good(&(data->temp_hyst), client,
ADM1021_REG_THYST_R, ADM1021_ALARM_TEMP);
adm1021_rd_good(&(data->remote_temp), client,
ADM1021_REG_REMOTE_TEMP, ADM1021_ALARM_RTEMP);
adm1021_rd_good(&(data->remote_temp_os), client,
ADM1021_REG_REMOTE_TOS_R, ADM1021_ALARM_RTEMP);
adm1021_rd_good(&(data->remote_temp_hyst), client,
ADM1021_REG_REMOTE_THYST_R,
ADM1021_ALARM_RTEMP);
data->alarms = ADM1021_ALARM_ALL;
if (!adm1021_rd_good(&(data->alarms), client,
ADM1021_REG_STATUS, 0))
data->alarms &= ADM1021_ALARM_ALL;
if (data->type == adm1021)
adm1021_rd_good(&(data->die_code), client,
ADM1021_REG_DIE_CODE, 0);
if (data->type == adm1023) {
adm1021_rd_good(&(data->remote_temp_prec), client,
ADM1021_REG_REM_TEMP_PREC,
ADM1021_ALARM_TEMP);
adm1021_rd_good(&(data->remote_temp_os_prec), client,
ADM1021_REG_REM_TOS_PREC,
ADM1021_ALARM_RTEMP);
adm1021_rd_good(&(data->remote_temp_hyst_prec), client,
ADM1021_REG_REM_THYST_PREC,
ADM1021_ALARM_RTEMP);
adm1021_rd_good(&(data->remote_temp_offset), client,
ADM1021_REG_REM_OFFSET,
ADM1021_ALARM_RTEMP);
adm1021_rd_good(&(data->remote_temp_offset_prec),
client, ADM1021_REG_REM_OFFSET_PREC,
ADM1021_ALARM_RTEMP);
}
data->last_updated = jiffies;
data->valid = 1;
}
up(&data->update_lock);
}
void adm1021_temp(struct i2c_client *client, int operation, int ctl_name,
int *nrels_mag, long *results)
{
struct adm1021_data *data = client->data;
if (operation == SENSORS_PROC_REAL_INFO)
*nrels_mag = 0;
else if (operation == SENSORS_PROC_REAL_READ) {
adm1021_update_client(client);
results[0] = TEMP_FROM_REG(data->temp_os);
results[1] = TEMP_FROM_REG(data->temp_hyst);
results[2] = TEMP_FROM_REG(data->temp);
*nrels_mag = 3;
} else if (operation == SENSORS_PROC_REAL_WRITE) {
if (*nrels_mag >= 1) {
data->temp_os = TEMP_TO_REG(results[0]);
adm1021_write_value(client, ADM1021_REG_TOS_W,
data->temp_os);
}
if (*nrels_mag >= 2) {
data->temp_hyst = TEMP_TO_REG(results[1]);
adm1021_write_value(client, ADM1021_REG_THYST_W,
data->temp_hyst);
}
}
}
void adm1021_remote_temp(struct i2c_client *client, int operation,
int ctl_name, int *nrels_mag, long *results)
{
struct adm1021_data *data = client->data;
int prec = 0;
if (operation == SENSORS_PROC_REAL_INFO)
if (data->type == adm1023) { *nrels_mag = 3; }
else { *nrels_mag = 0; }
else if (operation == SENSORS_PROC_REAL_READ) {
adm1021_update_client(client);
results[0] = TEMP_FROM_REG(data->remote_temp_os);
results[1] = TEMP_FROM_REG(data->remote_temp_hyst);
results[2] = TEMP_FROM_REG(data->remote_temp);
if (data->type == adm1023) {
results[0]=results[0]*1000 +
((data->remote_temp_os_prec >> 5) * 125);
results[1]=results[1]*1000 +
((data->remote_temp_hyst_prec >> 5) * 125);
results[2]=(TEMP_FROM_REG(data->remote_temp_offset)*1000) +
((data->remote_temp_offset_prec >> 5) * 125);
results[3]=TEMP_FROM_REG(data->remote_temp)*1000 +
((data->remote_temp_prec >> 5) * 125);
*nrels_mag = 4;
} else {
*nrels_mag = 3;
}
} else if (operation == SENSORS_PROC_REAL_WRITE) {
if (*nrels_mag >= 1) {
if (data->type == adm1023) {
prec=((results[0]-((results[0]/1000)*1000))/125)<<5;
adm1021_write_value(client,
ADM1021_REG_REM_TOS_PREC,
prec);
results[0]=results[0]/1000;
data->remote_temp_os_prec=prec;
}
data->remote_temp_os = TEMP_TO_REG(results[0]);
adm1021_write_value(client,
ADM1021_REG_REMOTE_TOS_W,
data->remote_temp_os);
}
if (*nrels_mag >= 2) {
if (data->type == adm1023) {
prec=((results[1]-((results[1]/1000)*1000))/125)<<5;
adm1021_write_value(client,
ADM1021_REG_REM_THYST_PREC,
prec);
results[1]=results[1]/1000;
data->remote_temp_hyst_prec=prec;
}
data->remote_temp_hyst = TEMP_TO_REG(results[1]);
adm1021_write_value(client,
ADM1021_REG_REMOTE_THYST_W,
data->remote_temp_hyst);
}
if (*nrels_mag >= 3) {
if (data->type == adm1023) {
prec=((results[2]-((results[2]/1000)*1000))/125)<<5;
adm1021_write_value(client,
ADM1021_REG_REM_OFFSET_PREC,
prec);
results[2]=results[2]/1000;
data->remote_temp_offset_prec=prec;
data->remote_temp_offset=results[2];
adm1021_write_value(client,
ADM1021_REG_REM_OFFSET,
data->remote_temp_offset);
}
}
}
}
void adm1021_die_code(struct i2c_client *client, int operation,
int ctl_name, int *nrels_mag, long *results)
{
struct adm1021_data *data = client->data;
if (operation == SENSORS_PROC_REAL_INFO)
*nrels_mag = 0;
else if (operation == SENSORS_PROC_REAL_READ) {
adm1021_update_client(client);
results[0] = data->die_code;
*nrels_mag = 1;
} else if (operation == SENSORS_PROC_REAL_WRITE) {
/* Can't write to it */
}
}
void adm1021_alarms(struct i2c_client *client, int operation, int ctl_name,
int *nrels_mag, long *results)
{
struct adm1021_data *data = client->data;
if (operation == SENSORS_PROC_REAL_INFO)
*nrels_mag = 0;
else if (operation == SENSORS_PROC_REAL_READ) {
adm1021_update_client(client);
results[0] = data->alarms | data->fail;
*nrels_mag = 1;
} else if (operation == SENSORS_PROC_REAL_WRITE) {
/* Can't write to it */
}
}
static int __init sm_adm1021_init(void)
{
printk(KERN_INFO "adm1021.o version %s (%s)\n", LM_VERSION, LM_DATE);
return i2c_add_driver(&adm1021_driver);
}
static void __exit sm_adm1021_exit(void)
{
i2c_del_driver(&adm1021_driver);
}
MODULE_AUTHOR
("Frodo Looijaard <frodol@dds.nl> and Philip Edelbrock <phil@netroedge.com>");
MODULE_DESCRIPTION("adm1021 driver");
MODULE_LICENSE("GPL");
MODULE_PARM(read_only, "i");
MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");
module_init(sm_adm1021_init)
module_exit(sm_adm1021_exit)
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